mod_cluster and multiple namevirtualhosts

[augustsimonelli]

Hello,

I'm new to mod_cluster and looking for some basic advice on the following. I'm using JBoss EAP 5.1 (ie .com offering) and mod_clsuter 1.0.4 (also from red hat).

mod_cluster installed as per the quikc start guide. using a proxyList and not multicast (ie -Djboss.modcluster.proxyList=10.68.15.8:6666). my cluster status page sees the node and deployed contexts (i put tomcat's sample.war in there). I can get there fine vie the server ip (ie http://10.68.15.8/sample/ - on port 80). The configs on apache are:

LoadModule slotmem_module modules/mod_slotmem.so
LoadModule manager_module modules/mod_manager.so
LoadModule proxy_cluster_module modules/mod_proxy_cluster.so
LoadModule advertise_module modules/mod_advertise.so

Listen 10.68.15.8:6666
<VirtualHost 10.68.15.8:6666>

    <Directory />
        Order deny,allow
        allow from all
    </Directory>

    KeepAliveTimeout 60
    MaxKeepAliveRequests 0

    ManagerBalancerName mycluster
    AdvertiseFrequency 5

    CreateBalancers 0

</VirtualHost>

<Location /mod_cluster-manager>
    SetHandler mod_cluster-manager
    Order deny,allow
    Allow from all
</Location>

Now i'd like to access that via a virtual host so i do:

<VirtualHost *:80>

    ServerAdmin [e-mail]
    DocumentRoot /var/www/html/jbsample/
    ServerName clusterbalance.com
    ErrorLog logs/dummy-host.example.com-error_log
    CustomLog logs/dummy-host.example.com-access_log common

</VirtualHost>

which means clusterbalance.com/sample should be the url ... but that doesn't work and throws:

[Mon Nov 15 16:07:51 2010] [warn] proxy: No protocol handler was valid for the URL /sample/. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

which tells me i need more mod_cluster (proxy config).

So i added:

ProxyPass / balancer://mycluster/

but that gives me:

[Mon Nov 15 16:08:59 2010] [error] proxy: CLUSTER: (balancer://mycluster). All workers are in error state

so i tried the various CreateBalancers options (0,1,2) but they all result in:

[Mon Nov 15 16:10:27 2010] [error] proxy: CLUSTER: (balancer://mycluster). All workers are in error state

So i missing something fundamental about how to tie the virtual into the backend.

Can anyone help? I'm RTFM'ing but, sadly, still a little cnofused.

I hope to have MANY virtuals on one apache tied into multiple different jboss instances behind them.

Thanks,

August

[augustsimonelli]

this is the output of the cluster manager:

balancer: [1] Name: mycluster Sticky: 1 [JSESSIONID]/[jsessionid] remove: 0 force: 0 Timeout: 0 Maxtry: 1
node: [1:1],Balancer: mycluster,JVMRoute: hostname.mydomain.com:8009:jboss.web,Domain: [],Host: 10.68.15.8,Port: 8009,Type: ajp,flushpackets: 0,flushwait: 10,ping: 10,smax: 1,ttl: 60,timeout: 0
host: 1 [localhost] vhost: 1 node: 1
context: 1 [/sample] vhost: 1 node: 1 status: 1

[augustsimonelli]

actually ... when i ask for / with my above setup i get:

[Mon Nov 15 16:51:36 2010] [error] proxy: CLUSTER: (balancer://mycluster). All workers are in error state

and when i ask for /sample i get

[Mon Nov 15 16:52:02 2010] [warn] proxy: No protocol handler was valid for the URL /sample. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

[augustsimonelli]

turns out i was using apache 2.2.3 and not 2.2.14 :-)

i've found if i have multiple mod_cluster virtuals (ie 6666, 6667, 6668) on one apache ... fronting multiple jboss clusters ... i can set my mod_cluster defaults in ONE of the virtuals and create unique balancers in each cluster virtual.

those unique balancers can be accessed in each virtual by mod_rewrite and ensure i send traffic to the right cluster.

red hat support advised i use rewrites, not proxypass directives so i have had to use createbalancers 0 as mod_rewrite (apparently) won't create the balancers.

this works pretty well.

i'm assuming this is "how you do it" but i'm not 100% sure. but mod_cluster is too good to miss out on so i will continue to find how to make it work for us!

[augustsimonelli]

Ok ... multiple mod_cluster virtuals is not the right way :-)

I'm now setting balancer names at the JBoss side ... Red Hat support + mod_cluster devs have advised "work form the bottom up."

Now i'm in business ... works prefectly. :-)

[willemnoorduin]

Hi,

I think this answers also my post http://community.jboss.org/thread/160001, in which I try to connect two different named virtual host to two different JBoss-AS clusters.

Can you post in what xml file you have set the name of the balancer in your JBoss

[augustsimonelli]

Short answer:

I added the following property to both the HA and regular settings sections (i'm using 1.0.4, 1.1.x doesn't have two sections):

<property name="balancer">ogbalancer</property>

of

./deploy/mod-cluster.sar/META-INF/mod-cluster-jboss-beans.xml

I've put all the details of my setup as a reply to your post (http://community.jboss.org/thread/160001) ... hope it helps; i'm curious if it works for others.

august